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Workaround freeze on Mac Chrome when checking read pixel config support.

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Chromium may ask us to read back from locked IOSurfaces. Calling the command buffer's
glGetIntegerv() with GL_IMPLEMENTATION_COLOR_READ_FORMAT/_TYPE causes the command buffer
to make a call to check the framebuffer status which can hang the driver. So in Mac Chromium
we always use a temporary surface to test for glReadPixels format/type support.

BUG=chromium:662802

Change-Id: I034e24faf3d780b6243f95af66d03dd68e12633c
Reviewed-on: https://skia-review.googlesource.com/6113
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
This commit is contained in:
Brian Salomon 2016-12-15 09:35:19 -05:00 committed by Skia Commit-Bot
parent 82c263f6e4
commit 625cd9e0c9
1 changed files with 10 additions and 0 deletions
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10
src/gpu/gl/GrGLGpu.cpp
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@ -2309,6 +2309,16 @@ static bool read_pixels_pays_for_y_flip(GrSurfaceOrigin origin, const GrGLCaps&
}
bool GrGLGpu::readPixelsSupported(GrRenderTarget* target, GrPixelConfig readConfig) {
#ifdef SK_BUILD_FOR_MAC
// Chromium may ask us to read back from locked IOSurfaces. Calling the command buffer's
// glGetIntegerv() with GL_IMPLEMENTATION_COLOR_READ_FORMAT/_TYPE causes the command buffer
// to make a call to check the framebuffer status which can hang the driver. So in Mac Chromium
// we always use a temporary surface to test for read pixels support.
// https://www.crbug.com/662802
if (this->glContext().driver() == kChromium_GrGLDriver) {
return this->readPixelsSupported(target->config(), readConfig);
}
#endif
auto bindRenderTarget = [this, target]() -> bool {
this->flushRenderTarget(static_cast<GrGLRenderTarget*>(target), &SkIRect::EmptyIRect());
return true;